HD 197911
star in the constellation Cepheus
HD 197911 (HIP 102274) is a bluish-white hued star in the deep northern constellation of Cepheus, close to the border with Draco and Cygnus. With an apparent magnitude of 7.669, it is too faint to be seen by the naked eye under most conditions, but readily visible using binoculars. The star is located some 3,020 light-years (930 parsecs) distant according to Gaia EDR3 parallax measurements, but is moving closer to the Solar System at a heliocentric radial velocity of −3.8±3.5 km/s.
The star appears close to the reflection nebula and H II region Sh2-130, alongside the A0-type star HD 197809 and G5-type star SAO 18999, though the latter two stars are located much closer to Earth at 469 ly (144 pc) and 198 ly (61 pc), respectively. The nebula itself is situated at a distance of 600 pc (2,000 ly).
Properties and origin
HD 197911 is a massive B-type star with the spectral type B2V, a mass 8.7 times that of the Sun and 9.2 times its radius. It is a runaway star traversing space at a peculiar velocity of 56.69 km/s. The star is thought to have once been part of a binary system, from which it was ejected as its companion ended its life in a supernova.
Initially, the star was thought to have originated in an OB association called the Cepheus OB2 association, which it left 2–3 million years ago, when the association was 3–4 million years old. This aligned with the age of the Cepheus bubble, an annular structure of infrared emission, providing compelling evidence for the binary-supernova scenario, that is, that it was blasted out of a binary system by a companion going supernova.
“HD 197911” enters the record as star in the constellation Cepheus. Crown Archives preserves that source wording while asking what star, constellation and Cepheus can confirm, complicate or overturn.
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“HD 197911” is worth following because a concise public description often conceals a longer documentary argument. Here, star, constellation and Cepheus provides the most credible route into that argument.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated May 10, 2026. The linked authority identifier is Q66641124. None of the 0 selected statements returned an explicit reference.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “HD 197911” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.